Download MendeleyCrystal structure of the central and C-terminal domain of the sigma(54)-activator ZraR.
Sallai, L., Tucker, P.A.(2005) J Struct Biol 151: 160-170
- PubMed: 16005641
- DOI: https://doi.org/10.1016/j.jsb.2005.05.006
- Primary Citation of Related Structures:
1OJL - PubMed Abstract:
The sigma(54)-dependent transcription in bacteria is associated with various stress and growth conditions. Activators of the sigma(54) protein contain a central domain belonging to the AAA+ superfamily of ATPases, members of which function in diverse cellular processes in both prokaryotic and eukaryotic cells. We describe the X-ray structure of an N-terminal domain deletion of the ZraR protein from Salmonella typhimurium, which is a homologue of the general nitrogen regulatory protein NtrC, at 3A resolution. The structure reveals a hexameric ring that is typical for AAA+ containing proteins but which differs from the heptameric ring found in the crystal structure of the AAA+ domain of NtrC1 from Aquifex aeolicus. The dimerisation interface between DNA-binding domains observed in the crystal structure suggests that dodecamers, rather than hexamers, might be the functionally important oligomer.
Organizational Affiliation:
European Molecular Biology Laboratory Hamburg Outstation, c/o DESY, Notkestrasse 85, D-22603 Hamburg, Germany.
